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COMMUNICATION SEMICONDUCTORS
EV6090
CMX639 CVSD CODEC Evaluation Kit
ADVANCE INFORMATION * * * Selectable Sample Clock Rates Easy Jumper/Switch configuration User Prototyping PCB Area
USER MANUAL
* * *
*
CMX639 Product Evaluation Telephone Handset Connectors On-board Speaker Driver Variable Gain Input Amplifier
Input Conditioning Audio -In x(-1) Audio +In Gain Block
P1: 1
P1: 2
P1: 3,4 2 0dB to -6dB Telephone Handset (Earpiece)
S
-20dB to +20dB E3
Enc Out
Dec In
DM
Enc In
DM
Dec Out
Data Clocks
x(-47) Mic Input
Data Rate (2) Algorithm
E4
CMX639
Speaker Driver +20dB
Telephone Handset (Mic) Direct In V+I N VDDI N AGND V-I N Power Conditioning
3
Force Idle (2) Data En Powersave
4 XTAL
Dec In
Direct Out
Computer Interface
Switch Control (Local)
The EV6090 is a single board evaluation platform used for the evaluation of the CMX639 CVSD codec. The board is powered from an external supply that can be used to evaluate CVSD encoder and decoder performance at different supply voltages. Jumpers are provided to select signal paths, clock source, measure device current, etc. Convenient I/O allows connection to a telephone handset, microphone, and/or a loudspeaker for simple experiments.
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CVSD CODEC Evaluation Kit
2
EV6090 Evaluation Kit
CONTENTS
Section Page 1 Block Diagrams..............................................................................................................3 2 Preliminary Information.................................................................................................5
2.1 2.2 Laboratory Equipment ....................................................................................................... 5 Handling Precautions ........................................................................................................ 5
2.2.1 2.2.2 Static Protection.......................................................................................................................5 Contents - Unpacking ..............................................................................................................5
3 Operation........................................................................................................................5
3.1 Set-Up ............................................................................................................................... 5
3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 Default Jumper Configuration..................................................................................................5 Connect external regulated power supply. ..............................................................................6 Set Mode of Operation ............................................................................................................6 Quick Test ...............................................................................................................................6 Further experimentation ..........................................................................................................6
3.2 3.3
Adjustments....................................................................................................................... 6 Operation .......................................................................................................................... 6
3.3.1 3.3.2 3.3.3 E3 Audio Input routing (to the CVSD encoder)........................................................................6 E4 Audio output routing (from the CVSD decoder) .................................................................6 S1 and S2 Switch Settings ......................................................................................................7
4 Schematic Diagrams and PCB Layout .........................................................................9 5 Specifications ..............................................................................................................11
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
2001 MX-COM, Inc.
CVSD CODEC Evaluation Kit
Input Conditioning P1: 1 Gain Block 2 x(-1)
Enc Out Dec In Data Clocks
P1: 2 0dB to -6dB
P1: 3,4
1 Block Diagrams
Audio -In
Audio +In E3 x(-47)
Enc In Dec Out
S
-20dB to +20dB DM DM E4
Telephone Handset (Earpiece) Speaker Driver +20dB
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
Mic Input
Data Rate (2) Algorithm
CMX639
3
Telephone Handset (Mic) 3
Force Idle (2) Data En Powersave
Direct In 4
Figure 1: Block Diagram
XTAL
Dec In
V+I N
Direct Out
VDDI N
AGND
Computer Interface
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
V-I N Power Conditioning
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Switch Control (Local)
EV6090 Evaluation Kit
Doc. # 20480218.003
CVSD CODEC Evaluation Kit
4
EV6090 Evaluation Kit
Digital Gates
Input Conditioning & Gain
CMX639
Output Gain
PC +V
E6 Speaker Driver
V+I N VDDI N GND V-I N Power Conditioning
V+ VDD GND VAGND DGND
Figure 2: Power Conditioning Block Diagram
Local Digital Control Encode Out
3
J1
Data Rate (2) Algorithm
Decode In Encode Clock
4
CMX639
Decode Clock
Powersave Data Enable Force Idle
To PC Interface
3 4
Figure 3: Digital Block Diagram
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CVSD CODEC Evaluation Kit
5
EV6090 Evaluation Kit
2 Preliminary Information
2.1 Laboratory Equipment
The following laboratory equipment must be user supplied to use this evaluation kit: Required * * 2.7-5.0V regulated DC Power Supply 8 speaker or headphones. NOTE: A stereo jack is supported because it is popular and available. If a mono plug is connected it will mute the output signal by creating a short to ground. A mono loudspeaker may be connected but it must have a stereo plug. Microphone POTS (Plain Old Telephone System) telephone handset may be used to listen to CVSD encoded and decoded speech. Optional
* *
2.2
Handling Precautions
This evaluation kit is designed for use in office and laboratory environments. The following practices will help ensure its proper operation. 2.2.1 Static Protection This product uses low power CMOS circuits which can be damaged by electrostatic discharge. Partially damaged circuits can function erroneously, leading to misleading results. Observe ESD precautions at all times when handling this product. 2.2.2 Contents - Unpacking Please ensure that you have received all of the items on the separate information sheet (EK6090) and notify MX-COM within 7 working days if the delivery is incomplete.
3 Operation
3.1 Set-Up
THE EV6090 IS CONFIGURED WITH A CMX639 DIP DEVICE FOR OPERATION AT 2.7 to 5.0VDC. A 4-conductor modular jack (J2), sometimes referred to as an `RJ22 jack,' has been provided to allow for quick speak/listen evaluation using a standard POTS handset. The following quick start will allow connection of a handset and power supply to quickly evaluate encoded and decoded CVSD audio. The user can select different sample clock rates and modes of operation to familiarize themselves with the operation of the CVSD device.
J2
EV6090
J1
Power Supply
Figure 4: POTS Set-Up 3.1.1 * * * * Default Jumper Configuration For single supply operation ensure shorting jumpers are installed at locations: E12, E6, E8, P4, and E5. To use the on-board crystal ensure jumpers E1 and E2 are installed. Ensure jumper E3 is set to position 1 and position 2, and jumper E4 is shorting position 2 to position 3 for audio routing to the handset. Install E13 to route handset to summing amplifier.
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CVSD CODEC Evaluation Kit
6
EV6090 Evaluation Kit
3.1.2 * * 3.1.3
Connect external regulated power supply. Adjust the supply for 5.0V Connect the positive lead from the power supply to "VDDIN" (P3:2) and the negative lead to "GND" (P3:3). Set Mode of Operation
To begin EV6090 operation, set switches S1-C1 ("CLKMODE1") to OFF and S1-C2 ("CLKMODE2") to ON to enable 32kbps sampling mode. Next, ensure that switch S1-C3 ("ALGORITHM") is set to OFF to enable the 3-bit algorithm. Alternatively, change S1 switch position C1 and C2 as shown in Table 1 for other sample rates. 3.1.4 Quick Test Connect handset and apply power. Adjust R6 clockwise to increase microphone audio level. Adjust R31 counterclockwise to increase audio level in the ear piece. 3.1.5 Further experimentation Other modes of operation are available for test. Forced idle channel mode of either the encoder or decoder can be realized by changing dip switch settings. The use of Table 1, coupled with a review of the CMX639 data bulletin, will allow the user to exercise all operating modes.
3.2 Adjustments
R6 - adjust audio input level to the CODEC. R31 - adjust level for both the telephone hand set and speaker volume.
3.3
Operation
Jumpers E3 and E4 allow for different audio input and output routing. For testing with audio signals applied at the "AUDIO IN" jack, jumper E13 should be removed to avoid having undesired amplified signals injected into the encoder input. For testing with audio signals supplied by either the microphone input or the telephone handset, jumper E13 should be installed. Due to the high gain nature of this signal path, however, R6 doesn't need to be adjusted >0dB. 3.3.1 * * * * 3.3.2 * * * * E3 Audio Input routing (to the CVSD encoder) RCA Audio input - RC1 Mic Input - J3 Telephone Hand set input - J2 Screw Terminal strip P2:1 input E4 Audio output routing (from the CVSD decoder) RCA Audio output - RC2 Screw Terminal strip P2:3 output Telephone Hand set output - J2 Speaker output J4 Jumper position 1 to 2 enables the following:
Jumper position 2 to 3 enables the following
Jumper position 1 to 2 enables output audio to the following:
Jumper position 2 to 3 enables output audio to the following:
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CVSD CODEC Evaluation Kit
7
EV6090 Evaluation Kit
3.3.3
S1 and S2 Switch Settings Circuit Condition When Switch Is: ON OFF See table on EV6090 for switch combinations.
Switch S1-C1
Name CLKMODE1
Description Used in conjunction with CLKMODE2 to set sampling rate and source (internal or external). Used in conjunction with CLKMODE1 to set sampling rate and source (internal or external). Determines whether 3-bit or 4-bit companding algorithm will be used. In general, 3-bit companding yields better results at rates of 32kbps and below, while 4-bit companding should be used at 48kbps and above. This switch is used in combination with the /POWERSAVE switch to determine the state of the CMX639 encoder output.
S1-C2
CLKMODE2
See table on EV6090 for switch combinations.
S1-C3
ALGORITHM
4-bit algorithm
3-bit algorithm
S1-C4
DATAEN
Encoder output is at high impedance regardless of state of /POWERSAVE switch. Encoder produces idle pattern at output. Decoder input taken from PCMCIA interface. Decoder output is VDD/2.
Encoder output is enabled if /POWERSAVE switch is OFF, and is set to VSS if it is ON.
S2-C1
/ENCODERFORCEIDLE
This switch causes a "perfect idle" pattern of 0101... to be present at encoder output. This switch selects the source of the decoder input signal.
Encoder operates normally.
S2-C2
DECIN
Decoder input taken from either DECIN screw terminal or encoder output. Decoder operates normally.
S2-C3
/DECODERFORCEIDLE
This switch causes a 0101... pattern to be internally applied to the CMX639 decoder, resulting in the decoder output pin going to VDD/2. This switch is used in combination with the DATAEN switch to determine the state of the CMX639 encoder output.
S2-C4
/POWERSAVE
CMX639 is in powersave mode.
CMX639 operates normally.
Table 1: S1 and S2 Switch Settings
2001 MX-COM, Inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CVSD CODEC Evaluation Kit
8
C1 C1 C1 C1 C1 C2 Sampling Clocks External Clocks 64kbps 32kbps 16kbps
EV6090 Evaluation Kit
S2
Not Idle /Encoder Force Idle Idle
CMX639 or Screw Terminal DEC IN PCMCIA Interface
Not Idle
Not Powersaved
S1
CLK MODE 1
3-Bit CLK ALGORITHM DATA EN MODE 2 4-Bit Enabled
ON
/Decoder Force Idle /Powersave Idle Powersaved
ON
S2 C4 C1 C1 C1 C1
S1 C4
Encoder Output State Enabled Vss High Impedance High Impedance
Figure 5: EV6090 Switch Settings
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
PCMCIA:OUT-0
E10 E11
J1:26
R17
ENCCLK
E7
P1:3 1UF R10 10K R26
5 4
1K R12 R25 C37
1 3
VDD
PCMCIA:A1
R28 1K
PCMCIA:A2
J1:2 J1:3 C11 R19
4 ENCCLK DECCLK N/C CLKMODE1 20 19 5 17 ENCFORCEIDLE CLKMODE2 DATAEN ALGORITHM ENCOUT DECIN DECFORCEIDLE POWERSAVE N/C XTAL 2 14 15 16 N/C BIAS ENCIN N/C DECOUT XTAL 21 VSS 11 VDD 22
1K
R29
2
E1
E2
2001 MX-COM, Inc.
S1:1 S1:2
DGND
DECCLK
P1:4 1K 10K R20 10K
6 7 8 18
1K
J1:18
PCMCIA:C1
PCMCIA:C0
J1:17
1
S2:1
R13
AGND
U1
.1UF 10K R14 1K R44 10K 74HC04 74HC04 R22 R39 10K
5 7 9
3
CVSD CODEC Evaluation Kit
DGND
11
S1:4
R11 C14 C36 1UF
AGND
J1:19
PCMCIA:C2
10
TP1
R21
6
3
1K
PCMCIA:B6
J1:15 1K .1UF BIAS
9 10 12 13
S1:3
J1:20
DGND
PCMCIA:C3
C7
C5 R8 SUMIN
100K
1 1
U3:B
3
4
U3:C
5
10K
R3 C9
2 3
1
2200PF R5 R7 10K
E3
P1:1 1K J1:1
ENCOUT PCMCIA:A0
.1UF
6 7 + 5
10K
AUDIO IN
1
V+ U2:B
LM6482 R2
10K C3
10K
3
R6
1UF
RC1
2 1
C6 1M
R4
2
8
-
U2:A
.1UF
CMX639
S2:2
P1:2
4
DECIN
R18 1K R16 R23 1K
J1:9 J1:21
7
PCMCIA:B0 PCMCIA:C4
3
+
C2
C1
68PF
VI/P_BIAS
DGND
C8 .1UF 1.024MHz
DGND
X1
33PF
AGND
VDD IN
P3:2 3.9
R1
1
E8
C10
C15
C12
C13
10UF
.1UF
.1UF
1000UF
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S2:3
R24 10K 10K
11 9
PCMCIA:C7
J1:24 V+_IN
E9
E12
E6
C33 R42 100 Ohm C31 .1UF 1000UF V+
AGND
J1:4 J1:5 J1:6 VDD
DGND DGND
1
S3
3
R27
1K
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
S2:4
R15 1K
DGND
1 2 3 10
.1UF
10K
4
LM6482
C4
2200PF R9
DGND
9
J1:22 P1:5
PCMCIA:C5 GND
4 Schematic Diagrams and PCB Layout
ENCIN
10K
GND
P2:1 P2:2 AMPS
AGND E4
DECOUT
GND
P2:3 P2:4
1
U3:A
2
Figure 6: CVSD Control Section
74HC04
J1:28
PCMCIA:EXCLK-0
AGND
AUDIO OUT
1
RC2
PCV+
2
PCV+
J1:8
PCMCIA:A7
V+ IN
P3:1
L1
3 4
J1:7
AGND
11
2
AGND
P3:3 C32 R43 1000UF VAGND
4.4mH
DGND DGND
U3:E P4
J1:33
AGND
10
E5
74HC04 J1:25
A/D_SHORT AGND DGND
9
U3:D
8
V- IN
P3:4
13
U3:F
74HC04
DGND
12
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EV6090 Evaluation Kit
Doc. # 20480218.003
100 Ohm
74HC04
C17
V+ 100PF R32
R36
100K
2001 MX-COM, Inc.
V+ C27 E13 SUMIN 0.1UF 1 V+ 8 2 .1UF AGND 10K VR41 3 + 4 .1UF U6:A 1 LM6482 C25 NEW_BIAS LM6482 4 C18 NEW_BIAS V+ 10K C26 R30 C20 R35 8 2 .1UF 3 + 10K U4:A .1UF 470K C16 C19 470PF R33 100K V.1UF AGND
CVSD CODEC Evaluation Kit
MIC
C5 C4 C3 C2 C1
J3
AGND
J2
2
C30
C29
R40
.1UF
C34
1UF C22 V-
R37
SPEAKER + 7 4 AGND 3
C24 2
U5 8
1
6
C5 C4 C3 C2 C1
5
C23
R38
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LM6482 V+_IN NEW_BIAS + 5 100K 0.1UF 100K AGND
EV6090 Evaluation Kit
Doc. # 20480218.003
AGND
10 Ohm
0.047UF
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
AGND AMPS U4:B 7 6 1 R34 R31 3 C28 6 5 +
J4
100UF
LM386
AGND
100K
Figure 7: Audio Amp Section
0.1UF
AGND
0.1UF
0.01UF
C35
10K
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
U6:B 7 LM6482 I/P_BIAS
4
TELEPHONE
3
C21
10
HANDSET
2
10UF
1
TEL_JACK/4
CVSD CODEC Evaluation Kit
11
EV6090 Evaluation Kit
VDDIN
10UF
R12
R11
COMPUTER CONTROL SECTION
R18 1K 1K
U3
74HC04
33PF
37 19
R29 R22
20 1
1K 1K 1K 1K 1K
1K
C31
E8
1000UF C33 C15 .1UF
E9
C12 R1 3.9 C13 .1UF 1000UF C32
P3
J1
1K
R42 100
L1
R13
R10 R6
R17
E12
1K R27
R28
AUDIO IN
E10 E11
10K R44
1K
RC1
AUDIO IN ADJ
1K R14
1000UF
POWER CONDITIONING SECTION
1K R15
RC1
100K
E6
R16
S3
C10
P4
www.mxcom.com www.cmlmicro.co.uk www.cmlmicro.com.sg
P1
ENCOUT DECIN ENCCLK DECCLK GND 16Kbit 32Kbit 64Kbit EXTERNAL ALGORITHM 3bit OFF 4bit ON
C7 2200PF
R7 10K
AUDIO OUT
68PF C2
1UF
RC2
1M R2
C17 100PF
R32 470K
470PF
U4
LM6482
.1UF C16 R33
100K
TEL HNDSET
C18 .1UF
R35 10K
E13
C19
E2
C1 33PF
R30 10K
C4 .1UF
C8 2200PF 10K R9
1.024MHz
X1
C6 .1UF
10K R4
E1
U1 E7
.1UF C37
RC2
C11
.1UF C5
10K R3
U2
LM6482
.1UF C3
HALT
R8 10K
10K R5
S3
EV6090
CLKMODE1 CLKMODE2
C27 .1UF
.1UF C36
R41 10K
.1UF C26
J2
C20 .1UF
1UF C14
MX6X9 CIRCUIT SECTION
OFF OFF ON ON
OFF ON OFF ON
0.01UF .1UF C29
C30
1UF
C9
U6
C25 .1UF
TP1
10K R19 10K R39 10K R23
10K R24
1 23
100K
LOCAL DIGITAL CONTROL SECTION
10K R25 10K R26 10K R21 10K R20
R40
10K
AUDIO CONTROL SECTION
10UF
C21
U5
0.1UF
LM386
C22
R34
E3 123
.1UF C34
100K R37
AUDIO OUT/ VOL ADJ
S2
1
0.1UF
C1 C2
E4
1UF
C35
C28
23
C3 4 C4 ON
1
C1 C2
23
S1 C3 4 C4
DATAEN
100K R31
R36
CLKMODE1
DECIN
ENCFORCEIDLE
DECFORCEIDLE
0.047UF
10 Ohm R38
SPEAKER
MIC
C23
OUTPUT DRIVER SECTION
Figure 8: Evaluation Board Layout
5 Specifications
Characteristic Storage temperature Operating temperature Analog ground Analog positive supply voltage Analog negative supply voltage DUT & Digital supply voltage Microphone input jack type Signal Designator Connector Designator Min -20 10 0 2.7 -5.5 3.0 mono or stereo stereo Typ Max 70 35 0 5.5 0 5.5 Units C C V V V V
AGND V+ IN V- IN VDD IN MIC
DECOUT GND
ENCIN
GND
J3
J4
J2:4, J3:C1, J4:C1, P2:2, P2:4, P3:3 P3:1 P3:4 P3:2 J3:C1, C5
POWERSAVE
CLKMODE2 ALGORITHM
100K
100UF
P2
C24
ON
Speaker output jack type
SPEAKER
J4:C1, C3, C5
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
GND V-IN
V+IN
E5
100 R43
CMX639
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
LM6482
0
Doc. # 20480218.003
All trademarks and service marks are held by their respective companies.

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